Improvement in machines for cutting rasps



A; NJREDMAN.

File Cutting Machine.

Patented Aug. 9. 1864.

UNITED STATES PATENT OFFICE.

ALEXANDERLN. REDMAN, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN MACHINES FOR CUTTING RASPS.

Specification forming part of Letters Patent No. 43,795, dated August 9, 1864; antedated July 23, 1864.

To aZZ whom it may concern:

Be it known that I, ALEXANDER N. Ran- MAN, of Malden, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Machines for Making Rasps; and I do hereby declare that the following description, taken in connection with the accompanying drawings, hereinafter referred to, forms a full and exact specification of the same, wherein I have set forth the nature and principles of my said improvements, by which my invention may be distinguished from all others of a similar class, together with such parts as I claim and desire to have secured to me by Letters Patent.

The present invention relates to certain'new and useful improvements in machines for cutting rasps, the essential feature of which consists in imparting to the rasping-tool an intermittent motion in a vertical plane, for the purpose of indenting or raspin g the surface of the metallic bar, as desired, the said tool being caused at the same time to travel back-and forth across the said bar, as it is fed along at regular and proper intervals of time by means of any suitable arrangement of feeding devices.

In the accompanying plate of drawings my improvements are represented, Figure 1 being a central longitudinal vertical section; Fig. 2, a side view; Fig.- 3, a transverse vertical section taken in plane of line A B, Fig. 4 5 Fig. 4, a top view, and Fig. 5 an end view.

a a in the accompanying drawings represent the supporting frame-work of the machine, consisting of two vertical parallel standards, b b, joined together. by cross-bars. Between the standards 11 b is a horizontal traveling platform, (I d, moving upon parallel guides or ways 0 c. On this platform d dihe metallic bar 0 to be rasped is secured, and this platform is then made to move in the proper direction for feeding the bar to the raspingtool used, by means of devices the arrangement of which will be hereinafter described.

f f is the driving shaft, placed transversely in the machine, and having bearings in the standards b b. On this shaft f f, between the standards I) b, is a wheel, g, having radiating arms h h, &c., at equal distances apart, and of which there may be any desired number.

t' i is a horizontal lever turning on a shaft,

j, to the outer end of which the vertical frame k k is secured, while the inner end, 1, extends within the plane of revolution of the radiating arms h h, 820.. before referred to. p

Attached to the lower portion of the vertical frame 70 k, at each end thereof, are springs m m, also secured to the frame-work a a.

0 o is the rasping-tool, secured in the outer end, p, of a lever-arm, q, with its fulcrum on the horizontal shaft 1", the inner end of said lever extending within the plane of revolution of said arm-wheel g. This lever q is placed between. the frame It It and the traveling platform d, before referred to, the said frame It It bearing upon the upper side thereof. Thus it will be seen, by revolving the arm wheel g, the arms [L h, &c thereof will intermittently and regularly cause the levers t' and q to turn on their respective fulcrums, thereby raising the frame 7c and raspingtool 0 and, still further, that after they have thus been raised the levers 1' and q then being disengaged from the said arm-wheel, they are caused to descend, the raspingtool 0 having suficient force imparted thereto by means of the springs m m, attached to the frame k, as to indent the surface of the metal bar 0, secured upon the platform (I. This movement of therasping-tool continues so long as the arm-wheel revolves, and it is evident the number of its movements per revolution of the arm-wheel may be regulated and varied by simply increasing or decreasing the number of the radiating arms h h, &c. While the rasping-tool is thus made to raise and lower, as above described, its lever, in which it is placed, has a horizontal transverse movement given to it, thereby causing the rasping-tool to move across the metallic bar by means of a cam way or groove, 8, of a wheel, t, on the horizontal shaft to. On the shaft u is a gear-wheel, o, interlocking with another gear, 20, of the driving-shaft f. Within the groove 8, before referred to, a stud, .r, of the horizontal shaft or fulcrum of the tool-lever q travels, which shaft is thereby caused to move horizontally back and forth in its bearings through a space equal to the horizontal travel of the camway in its course around the periphery of the wheel t.

In order to feed the metallic bar 0 to be rasped to the rasping-tool, the platform (I is operated in-the proper direction by means of the following devices, viz: y y is a ratchet- Wheel of a horizontalshaft, 2, of the framework a a. On the shaft 2 is a pulley, a around which passes a belt, I), attached to each end of the platform at, so that by operating the ratchet-wheel y the pulley a and belt I) will serve to move the platform d as desired. Engaging with the ratchet-wheel 51 is a pawl, a, hung at its end d on a pivot, f, of the vertical spring-lever g, against the upper end of which the projecting arm h of the drivingshaft f, as it revolves, impinges, thereby causing the said pawl to intermittently revolve the ratchet-wheel. The length of stroke of the pawl may be varied at pleasure, according to the degree of rasping desired, by simply changing its position with regard to the fulcrum of its operating lever g, a series of apertures H, 850., being made in said lever for that purpose.

From the above description it will be observed thatthe movement of the rasping tool in indenting the bar and its travel across the same, together with the feeding of the bar to the said tool, can be so adjusted with regard to each other as to cause any degree ot'fineness or coarseness of rasping to be given to the blank metallic bar, the advantages of which are evident.

Having thus described my improvements, what I claim as my invention, and desire to secure by Letters Patent, is

1. The general arrangement of mechanical devices, herein described, for forming rasps, the Whole operating together substantially as described.

2. Imparting to the rasping-tool employed the necessary up-anddown movement to form the rasp, by means of the arm-wheel g, leverframe It, and horizontal lever-arm q, arranged and operating together as specified.

3. The combination of the camgroove 8, horizontal shaft or fulcrum r, and lever q, arranged and operating together, as hereinabove set forth, for the purpose of causing the'indentingtool to travel back and forth across the blank bar while it is fed along to the said tool at regular and proper intervals of time.

' ALEXR. N. REDM AN.

Witnesses JOSEPH GAVETT, ALBERT W. BROWN. 

